Life, death, and in between

I found out today that my uncle that has lung cancer may decide to stop treatment. The chemo that he has been receiving has been making him so sick that he can't eat or do much of anything. He is supposed to find out on Tuesday if the treatments are working and if not he has decided to quit all together. How does somebody make that decision? How do you decide that it is time for you to go? He told his wife and children this just the other day. Makes me look at my pack of Camels in a whole new way...